Part A
AD8400AR100
テキサス・インスツルメンツ
- Lifecycle
- Active
- Stock
- 9927 個数
- Series
- データ取得 - デジタルポテンショメータ
Replacement verdict
Compatible functional replacement candidate
The AD8400ARZ1 and AD8400AR100 are both single-channel digital potentiometers from the AD8400 family in the same SOIC-8 package, sharing identical pinout, supply range, and interface characteristics. The only material distinction is the end-to-end resistance value (1 kΩ versus 100 kΩ), which directly affects the application's current and loading behavior. The AD8400AR100 is a viable functional substitute for the AD8400ARZ1 only where the circuit is designed or recalibrated for the higher resistance; designers must validate wiper current, bandwidth, and ratiometric accuracy in the target application before committing to the swap.
End-to-End Resistance
Not compatible
Package Type
High match
Interface Type
High match
Supply Voltage Range
Validation required
Parts at a glance
Part B
AD8400ARZ1
テキサス・インスツルメンツ
- Lifecycle
- Active
- Stock
- 4740 個数
- Package
- SOIC-8
- Series
- データ取得 - デジタルポテンショメータ
Key differences
Rows are prioritized by design impact. Highlighted values require attention during substitution.
Key electrical and mechanical differences between the two devices
| Parameter | AD8400ARZ1 | AD8400AR100 | Why it matters |
|---|---|---|---|
| End-to-End Resistance | 1 kΩ | 100 kΩ | The total resistance sets the current range and signal attenuation the digital potentiometer can provide in a circuit; a 100x difference fundamentally changes the application suitability. |
| Number of Positions | 256 | 256 | Determines the wiper resolution; both offer 8-bit (256-step) adjustment, so resolution is identical. |
| Number of Potentiometers | 1 | 1 | Indicates a single-channel device in both cases, so channel count is not a differentiator. |
| Interface Type | SPI (3-wire serial) | SPI (3-wire serial) | Both use the same serial control interface, so firmware and bus wiring are compatible. |
| Supply Voltage Range | 2.7 V to 5.5 V | 2.7 V to 5.5 V | Identical operating supply range means both fit the same system power rails. |
| Package / Mounting | 8-Lead SOIC (surface mount) | 8-Lead SOIC (surface mount) | Same package and footprint allow drop-in board replacement without layout changes. |
| Operating Temperature Range | -40 °C to +85 °C | -40 °C to +85 °C | Identical temperature ratings mean both suit the same environmental conditions. |
| Wiper Resistance | Approx. 50 Ω (typical) | Approx. 50 Ω (typical) | Wiper resistance adds a fixed series error; it is comparable for both, but its relative impact is far larger for the 1 kΩ version. |
| Typical Application Fit | Low-resistance gain/offset trimming | Higher-resistance level/volume control | The resistance value dictates which circuits each part suits; they are not functionally interchangeable without redesign. |
Need help validating a replacement?
Send your BOM and application constraints for technical and sourcing review.
Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | AD8400AR100 | AD8400ARZ1 |
|---|---|---|
| Part Status | Obsolete | Active |
| Digi Key Programmable | Not Verified | - |
| Taper | Linear | Linear |
| Configuration | Potentiometer | Potentiometer |
| Number of Circuits | 1 | 1 |
| Number of Taps | 256 | 256 |
| Resistance (Ohms) | 100k | - |
| Interface | SPI | SPI |
| Memory Type | Volatile | Volatile |
| Voltage - Supply | 2.7V ~ 5.5V | 2.7V ~ 5.5V |
| Tolerance | ±30% | ±33% |
| Temperature Coefficient (Typ) | 500ppm/°C | - |
| Mounting Type | Surface Mount | Surface Mount |
| Operating Temperature | -40°C ~ 125°C | -40°C ~ 125°C |
| Resistance - Wiper (Ohms) (Typ) | 200 | - |
| Base Product Number | AD8400 | - |
| Resistance(Ohms) | - | 1k |
| Temperature Coefficient(Typ) | - | 700ppm/°C |
Frequently asked questions
What is the main difference between the AD8400ARZ1 and the AD8400AR100?
Both are single-channel, 8-bit digital potentiometers from Analog Devices in an 8-lead SOIC package, but they differ in end-to-end resistance: the AD8400ARZ1 is the 1 kΩ version, while the AD8400AR100 is the 100 kΩ version. The "Z" suffix in AD8400ARZ1 denotes a RoHS-compliant package, whereas AD8400AR100 is the non-Z ordering code.
Are the AD8400ARZ1 and AD8400AR100 pin-compatible?
Yes. Both devices are offered in the same 8-lead SOIC (R-8) package with an identical pinout (CS, SDI, SCLK, GND, VDD, A, W, B), so they are pin-to-pin compatible and share the same PCB land pattern.
Do the AD8400ARZ1 and AD8400AR100 use the same digital interface?
Yes. Both use the same 3-wire SPI-compatible serial interface (CS, SDI, SCLK) and the same 8-bit command/address/data word format, so firmware written for one device operates the other without protocol changes.
What are the key specifications shared by the AD8400ARZ1 and AD8400AR100?
Both are single-channel, 8-bit (256-position) digital potentiometers with a nominal 10 kΩ?no?the shared specs include 8-bit resolution, SPI-compatible serial control, single-supply operation from 2.7 V to 5.5 V, and an operating temperature range of -40 °C to +125 °C in the 8-lead SOIC package.
How does the end-to-end resistance difference affect design use?
The AD8400ARZ1 provides a 1 kΩ end-to-end resistance, while the AD8400AR100 provides 100 kΩ. This changes the wiper resistance ratio, power dissipation, and the RC time constants when used with external capacitors, so the choice depends on the required current level and impedance of the surrounding circuit.
Can the AD8400ARZ1 be used as a drop-in replacement for the AD8400AR100?
Only if the circuit tolerates the resistance change from 100 kΩ to 1 kΩ. Because the package, pinout, and digital interface are identical, substitution is electrically straightforward, but the 100:1 resistance difference will alter divider ratios, load current, and bandwidth, so the design must be re-validated.
What is the significance of the "Z" suffix in AD8400ARZ1 compared with AD8400AR100?
The "Z" in AD8400ARZ1 indicates a RoHS-compliant, lead-free package per Analog Devices ordering conventions. AD8400AR100 is the non-Z ordering code for the 100 kΩ version; designers should confirm the RoHS status of the specific ordered part number against the manufacturer datasheet.
Are both parts specified over the same temperature range?
Yes. Both the AD8400ARZ1 and AD8400AR100 are specified for operation from -40 °C to +125 °C, consistent with the AD8400 family datasheet for the SOIC package option.